Studies in heavy metal pollution in agricultural land. 4. Cadmium absorption and translocation in rice seedlings as affected by the nutritional status and co-existence of the other heavy metal

Saito, Y.; Takahashi, K.

Bulletin of the Shikoku Agricultural Experiment Station 31: 111-131


Accession: 000754836

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The effects of N, P, K, Ca, Mg, Fe and Mn status of rice plants in Cd absorption and translocation was studied using sol.-culture. Cd content increased in plants deficient in N, Mg, P or Ca. With excess P, there was an increase in Cd content. The amount of Cd absorbed by N- or P-deficient plants was twice that in the control. Cd content of top:Cd content of root ratio was max. in N-deficient plants and min. in plants with excess N; there was a significant negative correlation between this ratio and root N content. In a 2nd experiment, Cd was supplied at 0.00, 0.05, 0.50 or 5.00 p.p.m. with Zn, Ni, Co or Cu at similar rates. Growth of rice plants was reduced with >0.50 p.p.m. Cu or with 5 p.p.m. Cd, Ni or Co; reductions in growth when there was Cd and another heavy metal, except Zn, in the nutrient sol. were greater than when there was only Cd. With 0.5 p.p.m. Cd, top Cd content decreased but at 5.0 p.p.m. Cd it increased with increased conc. of other metals in the nutrient sol. Cd content of the roots at each conc. of Cd and the amount of Cd absorbed at 0.05 or 0.5 p.p.m. Cd decreased with increased conc. of other heavy metals. It was suggested from the results that Cd translocation from roots to tops was accelerated by the accumulation of other heavy metals in the roots.